The muscles receives blood from the occipital artery.
2.
It then anastomoses with the ascending occipital arteries.
3.
The occipital artery also plays a role.
4.
A minute filament descends and joins the hypoglossal nerve as it winds around the occipital artery.
5.
This flap is supplied by the superficial temporal artery and vessels, the vertebral and occipital arteries and the perforators of the trapezius muscle.
6.
Occasionally it follows the course of the occipital artery and ends in the internal jugular; in other instances, it joins the posterior auricular vein and through it opens into the external jugular.
7.
The chief communications outside the skull take place between the superior and inferior thyroid arteries, and the deep cervical artery and the descending branch of the occipital artery; the vertebral artery takes the place of the internal carotid artery within the cranium.
8.
On the medial side of the process is a deep groove, the mastoid notch ( digastric fossa ), for the attachment of the digastric muscle; medial to this is a shallow furrow, the occipital groove, which lodges the occipital artery.
9.
At the back part and close to the upper or sagittal border is the parietal foramen, which transmits a vein to the superior sagittal sinus, and sometimes a small branch of the occipital artery; it is not constantly present, and its size varies considerably.
10.
It is perforated by numerous foramina ( holes ); one of these, of large size, situated near the posterior border, is termed the mastoid foramen; it transmits a vein to the transverse sinus and a small branch of the occipital artery to the dura mater.
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